One of your first stops should be Washington Apple Commission Visitors Center. Here, you'll be able to find your bearings and get lots of useful information before you begin exploring.
This tourist information center in East Wenatchee comes recommended by fellow travelers, so be sure to put it on your schedule. Don't stop there, though. There are loads more places waiting for you to experience after Washington Apple Commission Visitors Center. Town Toyota Center, Pybus Public Market, and Wenatchee Confluence State Park are nearby.